Jin Zixuan and Lan Wangji standing up to the Wens in the Xuanwu Cave, and the fight that follows after. Whereas the donghua gave us ten seconds of action at best, The Untamed extends it to about two minutes, and we get to see four of the five highest-ranked cultivators kick ass in all their finery.
Lan Wangji tells Wei Wuxian the name of the song: "WangXian".
While it isn't featured much, there's the rest of the Four Great Sects avenging the Jiang Sect by reclaiming Lotus Pier for them. The cherry on the cake is Lan Wangji cutting down one of the Wen flags and then stepping right on it, with cold and determined eyes.
Lan Wangji arriving at the Nightless City to ambush some Wen soldiers and ask them about Wei Wuxian's whereabouts, all the while in a state of ice-cold Tranquil Fury. Think of Episode 14 of the donghua, but this time he's in complete control of his emotions and is the one with the upper hand — both of which form a deadly combination from someone like Lan Wangji.
There's also when he coldly tells the Wen soldiers to kneel. While it's not what you'd expect from him, keep in mind that moments earlier the Wen soldiers were mocking Wei Wuxian for being the son of a servant, and Lan Wangji likely overheard that.
Wei Wuxian having his bloody revenge on Wen Chao and Wang Lingjiao. Creepy and terrifying? Yes. Karmic and satisfying? Also yes.
Although it was mainly a tense moment, there is Wei Wuxian telling Jin Guangshan and all the cultivators in attendance that Jiang Yanli has a right to decide whether she wants to marry Jin Zixuan or not. The topper is when Jiang Yanli adds to his statement by declaring that what she wants is to help her brothers rebuild Lotus Pier.
The Untamed takes Wei Wuxian's badassery in archery Up to Eleven when, while blindfolded, he shoots not one but five targets at once with each arrow hitting the bullseye. It even impresses Nie Mingjue and Lan Xichen enough to be the first to clap in earnest.
Mianmian basically giving all the cultivation sects the middle finger before leaving. There's even more weight in this adaptation since she's standing up directly to the Jin Sect.
Lan Wangji standing against his uncle when the latter berates him for defending Wei Wuxian. At this point, Lan Wangji is still conflicted with what's truly right and wrong, but even before the First Siege he already is certain in his decision to protect Wei Wuxian.
Although it was a futile effort, Lan Wangji standing his ground against the entire Jin Sect when they planned to siege the Burial Mounds is commendable nonetheless. Even when this earns him three-hundred lashes from his own sect, while he accepts it with iron-clad dignity he doesn't feel he has anything to repent for, even questioning his uncle about their world's Grey and Gray Morality.
Ouyang Zizhen verbally giving Sect Leader Yao what for when he remains ungrateful towards Wei Wuxian for saving their lives, reminding them that if it weren't for the latter they would have all been zombie fodder by now. Not even Jiang Cheng's subtle threats towards his own father do anything to intimidate the young lad.
Even if it sends both the characters and the audience in tears, Wen Ning still did what had to be done by telling Jiang Cheng the truth behind his golden core, pushing them one step forward towards closure and possibly even reconciliation.
Say what you will about the series, but the behind-the-scenes videos show the sheer amount of effort the production team had made into creating the show, from crafting all the props used in the series from scratch, to training the entire cast in music, arts, calligraphy, and swordplay — which all in all is nothing short of incredible.
Additionally, The Untamed also gets credit for being so gutsy in how it portrayed Wei Wuxian and Lan Wangji's relationship on-screen. Even if it couldn't explicitly adapt the romance, it didn't hold back with the subtext even with the threat of censorship breathing down its neck.
The series is basically Win the Crowd personified, as seen when its rating in Douban increases from 4.4 to 7.8. Sure, it's not an 8 or a 9, but it still went so far from a remarkably low score and as such it's nothing to scoff at.
The Untamed managed to become the highest top-rated Asian drama in MyDramaList, with the only other Chinese drama coming close being Nirvana in Fire, and given how the latter is considered a masterpiece in its own right, this is no small feat.